BNSF Dash 9 modeling help

Note, this article is not for the non-rivet counters among us. It picks apart BNSF Dash 9's so that you can identify what you need to make it look "correct".

For those of you who are not familiar with BNSF Dash 9's, and the idiosyncrasies of "rivet counting", check this out for a demonstration.

The following are different "Phases" of Dash 9's in the BNSF inventory.

BNSF 599-699, No 666, Fmr Santa Fe, delivered in War Bonnet.
Notice the grills on the doors are all the same height.  Also notice the "X" panels near the Dynamic brake, there is only one.  These units have a top fill sand box, but I'm unsure if the door exists below the light.

BNSF 700-799, ordered by Santa Fe (or at least Santa Fe motive power board, after BNSF merger), delivered to BNSF in BNSF Warbonnet.

BNSF 960-1123, BNSF (Maybe BN motive power board, after BNSF merger) spec, delivered in H1 units.
Come standard with the staggered grill again, 2 "X" panels, THREE window cab ala the Santa Fe units, and a end fill sandbox.  If you look close, you'll be able to see the lack of panels above the "X" panel area.

BNSF 4700-4719, ordered by Santa Fe, delivered with "Santa Fe" in the cigar band on the nose. Modern BNSF spec units, delivered in BNSF Warbonnet.

BNSF 4720-4910?, H2 units, Many delivered sans lettering, or in primer.  Characterized by smaller then normal BNSF text in nose cigar band.
These have the characteristic 4 window cab, the twin "X" panels (hard to tell), no roof panels (just a flat sheet) above the "X" panels, and staggered grills.  They also have a door on the rear of the long hood, and top fill sand box.

BNSF 4000-4199, 4300-4699, 4911?-5529, & 5841-5843, Lastly we have the BNSF spec, delivered in H2 units.
These units all have a top fill sand box, door on the rear of the long hood, staggered grills, and 2 "X" panels, with no roof panels above.  #5841-5843 are sandwiched in between AC4400's & ES44AC's, and are warranty protection units, provided by GE as a replacement for a wrecked unit.

There there's some other details...
The Fmr Santa Fe units pose one last hurdle, the trucks!  They seem to have been delivered with this truck:

BNSF seems to replace them on an as needed basis, with High-ads like all the Dash 9's & AC4400's to follow:

There's other differences, like step count. The Santa Fe units have one less step then any other Dash 9.

Modeling hints...
Lucky for us HO scale BNSF modelers, accomplishing a unit is about to get easier.  Details west is said to be working on a 4 window cab piece for the Dash 9's & AC4400's.  I cannot wait for it to come out, I need a TON.  We've also got a detail pack from Details West to get the correct twin "X" panel for the hood, and it comes with a nice overlay for the cooling area.  However, we're stuck when it comes to the door on the rear hood.  Scratch building time, unless you're handy and can make a resin cast copy.

Use a Kato 4 step gull wing to model Santa Fe bought units, otherwise, buy an A-line step kit and remove & replace the steps on an Athearn, RPP, or Kato 5 step.

Athearn makes both straight & staggered grill models.  "Undec Santa Fe Gull Wing" has straight, "Undec Gull Wing" or "Undec BNSF" would refer to staggered.

Kato makes an appropriate early Hi-Ad truck, however, they got the anti-hunting dampers wrong.  I'd assume the late Hi-Ad Kato trucks have parts for the angled anti-hunting dampers, however I do not own one.  I'm using Athearn angled anti-hunting dampers on my Kato early Hi-Ad.

Most BNSF Dash 9's have late Hi-Ad's, with a few early Hi-Ad's from the Santa Fe units mixed in.

The Conductors side rear & Engineer's side front side frames have angled anti-hunting dampers.  The opposite side frames have 3 exposed roller bearing caps, which does not look to be offered complete in a side frame, however Smokey Valley (HO scale) has the part, if you wish to drill out the side frame and add it.

[Ed note:] Since the time of this article, both MTH, and Scaletrains have released appropriate BNSF version units, with Athearn announcing their version due in 2021 in the Genesis 2.0 line.  Read about the Scaletrains here: Quick Look: Dash 9

I've built up 3 MTH units, modifying them in the way of paint, and road number changes:

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